(") BULLETIN DE l'hERBIEB B01SS1EK. (6) 



Favignana, Maretiino. Pantellaria and Linosa (Gussone). Sardinia, near Cagüari 

 (Ascherson). 



Tripoli (Forskai, about 1761). 



Tunis {Wahl, original spécimens, « in ruderatis »). 



ß. linearifolia Williams. 



Gaules 18-27 centim. Folia linearia longiora : internodia breviora, 

 Sepala augustiora lanceolata. 



Syn. Arenaria procumbens var. linearifolia M oris, Fl. Sardoa, I, p. 276 (1837). 

 Arenaria geniculata (non Poir.) Biv. Sicul. Plant, cent. II, p. 12 (1806). 

 Arenaria extensa, Duf. in Ann. Sc. gen. Phys. VII, p. 291 (1820). 

 Àlsine geniculata, Strobl in Oesterr. Bot. Zeitsch. 1885, p. 212. 

 Alsine extensa, Nym. Consp. fl. Eur. p. 119 (1878). 



Arenaria externa, Wülk. in Willk. et Lge. Prodr. fi. Hisp. III, p. 613 (1878). 

 Iconogr. Boccone, Ic. descr. PI. Rar. Sicil. p. 18, t. 10, f. 3 D (1674), Alsine 

 maritima altera, angustis foliis. 



Vahl's original description of the species is as follows : — « Radix 

 « perennis. Caules plures, prostrati, diffusi, pédales, basi lignosi, tere- 

 « tes, filiformes. Rami simplices, apice dichotome divisi. Folia sessilia, 

 « opposita, unguiciilaria, superiora majora, interstitiis duplo breviora : 

 « rudimenta foliacea ex omnibus axillis. Panicula terminalis, dichotoma. 

 « Flores pedunculati, Arenarias maritimse, at minores. Pedunculi capil- 

 « lares, uniflori, pubescentes. subviscosi, unguiculares. Calycis foliola 

 « ovato-lanceolata, margine membranacea. Petala rubra, cal) r ce partim 

 « breviora. » 



Gay says in bis mss. note attacbed to a spécimen, - « biseriata fila- 

 menta inter Alsineas sola mihi Arenaria procumbens obtulit, quam ob 

 causam et propter notulas quasdam alias satis graves in genus pro- 

 prium accipienda videtur, sie definiendum. » But in certain species of 

 Arenaria, particularly in those of the small subgenus of Pentadenaria, 

 the filaments are certainly biseriate and the alternate stamens spring 

 from a distinct gland, the other stamens being without a gland at the 

 base. 



Mr. John Ball in his examination of North African spécimens was 

 unable to separate and distinguish Desfontaines' Arenaria hernia- 

 riœfolia from Bhodalsine procumbens. He says, « species satis ludibunda 

 quoad formam foliorum et longitudinem sepalorum, sed varietates sta- 

 bilire inutile dueo. » Apart, however, from the obvious though speeifi- 

 cally unsatisfactory character of the color of the petals there are cor- 



